Question

Exercise: (a) Calculate the current for the JFET in Fig. 4.34 for VGS = ?2 V and VDS = 3 V.
What is the minimum drain voltage required to pinch off the JFET? (b) Repeat for VGS = ?1 V
and VDS = 6 V. (c) Repeat for VGS= ?2 V and VDS = 0.5 V.
Answers: (a) 184 A, 1.5 V; (b) 510 A, 2.5 V; (c) 51.0 A, 1.5 V
Exercise: (a) Calculate the current for the JFET in Fig. 4.35 for VGS = ?2 V and VDS = 0.5 V.
(b) Repeat for VGS= ?1 V and VDS = 6 V.
Answers: (a) 21.9 A; (b) 113 A

(Transfer characteristic for a JFET operating in pinchoff
with IDSS = 1 mA and VP = ?3.5 V. )

Answer 1